Let's encrypt certificate renew not working on 5.99

Hello,

i have a problem with virtualmin 5.99 when i try to renew my Let's encrypt certificate. Today my Let's encrypt certificate expired and i tried to renew it manually but doesn't work. Last time it worked was three months ago and it was configured to update the certificate automatically every 2.8 months.

I upgraded Webmin to 5.99 version but it still does not work. I did not changed anything to my DNS, firewall, only upgraded webmin.

I really need tho get this bug fixed because my site is broken without SSL.

I get this error when i'm trying to renew the certificate from virtualmin:

Parsing account key... Parsing CSR... Registering account... Already registered! Verifying www.xxxxxxxxxxxxx... Traceback (most recent call last): File "/usr/share/webmin/webmin/acme_tiny.py", line 235, in main(sys.argv[1:]) File "/usr/share/webmin/webmin/acme_tiny.py", line 231, in main signed_crt = get_crt(args.account_key, args.csr, args.acme_dir, args.dns_hook, args.cleanup_hook, log=LOGGER, CA=args.ca) File "/usr/share/webmin/webmin/acme_tiny.py", line 184, in get_crt domain, challenge_status)) ValueError: www.xxxxxxxxxxxxxxx challenge did not pass: {u'status': u'invalid', u'keyAuthorization': u'ixHf2KblIOQ3CYOnDkjPQSVIEo7naYtlEzpr0jNw8K0.lNXJCC5QfC9YOHAce9XBUu4PmgVHbJlBDHBl68hwIhQ', u'uri': u'https://acme-v01.api.letsencrypt.org/acme/challenge/w02v0XZ2fxMzKe9rmiwa...', u'token': u'ixHf2KblIOQ3CYOnDkjPQSVIEo7naYtlEzpr0jNw8K0', u'error': {u'status': 400, u'type': u'urn:acme:error:connection', u'detail': u'DNS problem: NXDOMAIN looking up TXT for _acme-challenge.www.xxxxxxxxxxxxx'}, u'type': u'dns-01'}

Thank you, Marius